What happens at time “C” of the action potential?
a. sodium-potassium pumps are active
b. potassium gates close and sodium gates open
c. sodium gates close and potassium gates open
d. positive feedback begins
e. both potassium gates and sodium gates close
Answer: c
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Transfer RNA molecules
A) function to transfer ribonucleotides to RNA polymerase during transcription. B) function to transfer the correct amino acids to the ribosome during translation. C) contain codons that bind to ribosomes during translation. D) are only present in the nucleus or eukaryotes.
The collars on the cells of choanoflagellates have the function of:
A. protecting the flagellum B. filtering bacterial food from the water C. directing currents away from the flagellum D. storing waste materials of the cell E. attaching to the substrate
Which of the following is not true about archaeal ribosomes?
A. They have similar antibiotic sensitivities to those of bacteria. B. They are 70S like bacterial ribosomes. C. They may possess ribosome binding sites homologous to bacterial Shine-Dalgarno sequences. D. All of these are true about archaeal ribosomes.
Hominins evolved when the climate was ____
a. wet and hotter b. wet and cooler c. dry and hotter d. dry and cooler e. similar to today